Need help

I am trying to achieve the following with my project as per badly drawn schematics and diagrams (sorry its the best I can do)

Schematic of transmitter: Pasteboard - Uploaded Image
Schematic of reciever: Pasteboard - Uploaded Image
Schematic of entire project: Pasteboard - Uploaded Image

My attempt of code for client so far: https://pastebin.com/ggVVi6q4
My attempt of code for reciever so far: https://pastebin.com/teJLEfrR

Type of transmitters I am using:

http://www.ebay.co.uk/itm/NEW-Gift-ARM-MCU-WL-transmitter-and-receiver-link-kit-433Mhz-RF-for-Arduino-HOT-/172250186663?hash=item281ae943a7

For the client code located at: https://pastebin.com/ggVVi6q4

How do I use the library or/and how do I send over the temperature and pressure data using packets in the C/Arduino code, I literally have no idea how to do this, would I actually need to use the radiohead library to achieve this because I can not find anything of relevance in the documentation or would I do it in actual some form of raw C code, if so how? Or at least point me in the right direction?

Messaging protocols can be challenging to develop, esp for a novice. I suggest you go with the Radiohead library and move on to the rest of the project.

The library and associated website contains plenty of examples to review and modify to send pressure and temperature data.

Let us know if you have any questions on the library usage.

Pat.

I am stuck on something at the moment, in respect of the packet I have been asked to write it in 'code' as 'bits' so temperature -> bits -> packet then transmit the packet, in respect of using the libraries I can't see anything of relevance there and neither do I know how to write this in code especially in terms of bits, e.g. uint8_t and 0xFF, but those two examples are just random guesses, other than that I am completely clueless on how to write this exact part in the code, any advice anyone can give on that would be much appreciated?